Ah finally got my toolchain to work with these instructions: http://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-Bootloader:U-Boot
The u-boot.img I compiled out of there works just fine - so now let's see what happens when I hack it :D On Saturday, March 22, 2014 12:46:51 PM UTC-4, Louis Thiery wrote: > > Jumping in a little late perhaps but my concern is slightly relevant to > the discussion here. > > Nelson desribes the boot order: > > bootrom loads MLO from eMMC (if that fails it moves to microSD) > MLO loads u-boot.img from eMMC > u-boot.img first looks at microSD for uEnv.txt, reads that file in. > > I'd like to reverse that last step and make it to default to uEnv.txt from > the eMMC. > > But I have no idea how to modify u-boot.img. What should I be reading? > > Or is there a u-boot.img that exists already that will allow me to boot > off of the eMMC even if the flasher uSD is present (which I understand is > the HW default)? > > Thanks, > Louis > > On Friday, March 7, 2014 11:12:13 PM UTC-5, Loren Amelang wrote: >> >> My long but successful "learning experience" is reported in: >> https://groups.google.com/forum/#!topic/beagleboard/zNtdwtPf2Q8 >> >> Definitely not simple, but possible... Without making any changes to the >> eMMC installation! >> >> On Monday, February 17, 2014 10:17:22 PM UTC-8, Loren Amelang wrote: >>> >>> Robert, >>> >>> My BBB absolutely must default to booting from the uSD. I know I >>> could short the boot switch, or move pull-up/down resistors, or create a >>> hardware switch gated from reset, but I don't want to lose hardware >>> compatibility with other BBB boards, or give up the option of manually >>> booting from eMMC occasionally. The code you suggest here sounds perfect - >>> but I'm not positive what to do with it. From the formatting of the text, I >>> suspect it is intended to be compiled into a new u-boot.img and MLO image, >>> but I'm not sure how to do that. >>> >>> Before I spend hours learning how, is there a chance I could just insert >>> the basic ideas into my uEnv.txt as "mmcboot=mmc dev 0; if mmc rescan ; >>> then ..."? It does look like uEnv.txt is read before the mmcboot command >>> runs... >>> >> >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
